Hydraulic elevator



J. P. OSCHGER. HYDRAULIC ELEVATOR. APPLICATION FILED JUNE 18.1918.

Patented Aug. 24, 1920.

V @Amw mwQm u m UNITED STATES Application filed June 18,

To all whom it may concern:

Be it known that I, Josnrrr P. Osoncnn, a citizen of the United States, residing at Chicago, in the county of Cook and State of :Tllinois, have invented a new and useful Improvement in Hydraulic Elevators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification, in which- Figure l'is a side elevation, partially in section, of one form of my invention, and

Fig. 2 is a detail sectional view of the cushioning apparatus and the valve therefor. .This invention relates to animprovement inhydraulic elevators, and more particularly .to the type of elevator-operating devices shown in Patent No. 1,116,615, issued to Charles E. Oschger on November 10, 1914. 4 :The object of my invention is to provide :an inexpensive and efficient valve system for controllingthe flow of water to and from 'the cushioning apparatus, and in which the pressure for controlling the valve for the cushioning apparatus will vary in accordance with the pressure in the line or main water-supply tank.

The precise nature of my 1nvent1on will be best understood by reference to the accompanying drawings, which will now be deserlbed, it being premised, however, that various changes may bemade in the details of construction and the general arrangement oi the parts without departing from the spirit and scope of my invention, as defined in the appended claims.

In the drawing, the reference character 2 designatesthe elevator car, 3 the'plunger therefor, and 4 the hydraulic cylinder for the plunger,'the apparatus being shown in =this. case:as attached to a plunger elevator, although it-may be employed with a hori- -zontal cylinder elevator or a vertical cyl1nder elevator.

5 designates the controlling valve having an inlet port 6 connected to the'i'isual-pressure tank 7. 8 designates the exhaust port-and 9 the port communicating :with the valve 5, and which port is in direct communication with the pipe 10 connected to thecylinder 4:. The stem 1101 the valve carries three valve disks 12, 13 and 14:, so

arranged-that in one position'of the valve there is a free (30111180111011 between the ports (Sand 9-, while the port 8 is closed. In its second position, the ports 8 and 9 are connected, while the port 6 is closed, and in a Specification of Letters Patent.

PATENT OFFICE.

JOSEPH P. OSCHGER, OF CHICAGO, ILLINOIS.

HYDRAULIC ELEVATOR.

Patented Aug. 24, 1920.

1918. Serial No.240,621.

which is mounted directly on the top of the flange of the pipe 15. Mounted within this casing 18 is a sleeve 19 having p0rts'20 through the walls thereof. This sleeve 19 has a threaded connection with the lower end of the casing 18. hiounted on the upper portion of the slceve.19 is a shell 21. The lower portion ofthe shell 21 and the sleeve 19 are-arranged to form cylinders for the pistons 22 and 23, respectively, and 22 designates a stop for the piston 22, which is arranged to limit the downward movement thereof. These pistons are provided with cup-shaped washers to form tight joints between the pistons and the cylinders to re.- strict the flow of fluid from the casing 18 to the branch pipe 15. Connected to the up- ;per and lower portions of the casing 18 is a water gage glass 24 for noting the height of the column of water within said casing. In the upper portion of the shell 21 is formed a large air chamber which is in direct communication by means of a pipe 25 with the air space of the pressure tank 7, so that by this arrangement, the top of the piston 22 is acted upon by the air pressure from the tank 7, whilethe bottom of the piston 23 is at times under the pressure of the water from said pressure tank which passes through the port 6 when "the elevator is moving upwardly.

Extending from the lower part of the casing 18 to the branch pipe 15 is a connection 31, having a check valve therein to permit fluid to flow'from the casing 18 tothe branch pipe 15, but to prevent the flow of fluid from the branch pipe to the casing 18. This valve is held to its seat by a'spring 32 surrounding the stem 33 of the valve, and is arranged to be adjusted to vary the tension in any desired manner or in a manner shown in the Patent'No. 1,116,615. Communicating with the connection 31 is a drainpipe 26 which leads to a discharge .tank 27, and 28 is avalve in said line for cutting off the flow from the casingil8vto the tank 27. 29 is a valve in the pipe 25 for cutting off communication between the shell 21 and the pressure tank, While TSO designates a pet cock in the top of the easing l8 for relieving the pressure therein, if

v desired.

1 v-9,;thc flow ofawater from thepressure: tank :to the pipe 1.0 would suddenly be stopped. This sudden movement of i the valve would cause iZhGiCZLP'tO come-toastop with ajar, unlesscushioning means were provided, as the .car could [not move upward :under its amomentum, .iwithout causing a partial flvacuum ingtheicylinder A. If thevalves are :suddenly ilinoved .--to athe zposition Ejust described the car would not come :to a sudden stop, ;-as ziwater' would'ibe drawn :from the casing 18 through the oconnectionfi-l. ?By

,means of this arrangement, no vacuum would be .formed in thecylindcr 4 as water as ,drawnyifromsthe casing :18. 7

Assum ng now that the ear :was moving down, ;the' Water passing from :the 1 cylinder .out throughithe .port; Send the valve :issuddenly moevede so :that the disks 13 and 14:v are on oppositesides of the port 9. llhis sudden movement of-theivalve will cut off ;the 'fiOW of;fluid2from:the pipe lO-tosthe port '8,

- the'aback pressure inthe pipe '10 would :be

forced -&through the {pipe 215 and amove :the pistons :22 and 23v upwardly against :the

- pressure in themain tank, ithe excess water passing through 4 the ports 20 into the casing :18, softhajt the elevator would be ihroughtzto a stop gradiutlly. Asthe -piston22isalways i c sing s18;

-:' The advantages of'my'finvention result fifilltanlgjan actuating-cylinder, a supply and under ,line pressure through pipe 25, the

,relie f yalve formed of-the pistons 22and'23 iw ill be returned to .the position shown in ithedrawings asisoon as the car :has come :to res 7 If reason of 'leakage or :other causes, the volume of air in the a pper part =of the casing 1 8 becomes too greatly ireduced, the

valve 1,7 can beclosed and the valves 28am] 30 opened to permit :flu'id :to vpass from -the cas ng'18; to ;the tank-27 and admit air to the (fromthe provision of ;a valve isystem for a "cushioning apparatus i-n' which the valve is .,-under;the control 01f the pressure :in the main suppl-y ,tank, so that no adjustments need be mad for varying pressure'.

:l l fmz v 1,111 a hydraulic, elevator, ;a;lipressure outlet pipe leading thereto, a controlling valve for said pipe, a cushioning reservoir connecte'd'to a branch of said plpe, a valve nhsaidconnection, an a1r chamber above said valve, andvconnections between said air chamber and the pressure tank,.for the elevator, substantially as described.

-2.*In:.iaihydnaul-ic elevator, a cylinder, a pressure tank containing air and water, a controlling valve, connections leading from said i controlling valve, .to i the cylinder: and

f to l the spressure tank, an'leikhau'st fromsaid controlling valve, a cushioning rese-rvoir comprising a chamber a containing -:air vand water, operative connections between the (lower end of. said: cushioning ;-reservoir and 1 the connection; leading from! the valve'tor the cylinder, 3a valve'zfor controlling l the 2 flow: of fluid from said pipe to the: cushioningreservoi-r,:-an airchamber aboveathe fvalve,'.iand a connection extending :from saidqair chamber to theairspa'ceiofzthe :pressur-e tank, substantially as described.

=3. -A- motor cushioning device *for hydrau- "lic elevators, 1 comprising .a pressure tank,

me-ans forsupplying opcratingifluidsto the motor :from said tank, an air cushioning chamber operatively connected with said motor, means tforisupplying iairitorsaid cushioning chamber from said;pressurertank, and :means :for: compressingithe airein said cham- 7 her when rthe :descent (of the elevator :is

stopped,substantially asidescribed,

"4L; Aemotor cushioning device tforihydrau- 'lic elevators, comprising :a pressure tank, means for supplying operating zfluid to the imotor sfrom said ltank, -an air cushioning chamber, a lpiston therein,';means for supiplying airzto said-chamber sfrom the pressure :tankrat one: s'ideiof rthe pi ston, and ran operafilVG connection between (the -:chamber at ithe 501 11161 side of 'the piston :and the *motor for moving the'plston to :cfompressvthe "air in .said chamber when the dcscentof theielevator is stopped, substantiallyns described.

5. In nit-hydraulic elevator, a niotor, a pressure :tank, means :for supplying (operatling'fluid to the :motor from saiditank,a cush ioning':reSer-voir comprising air {and water uchambers, anioperative LCQIIIIQChiOIlibBbWGGIl said air chamberza-nd ithe pressureitank, and an operative connection between said (chambers and the :motor, substantially as described. M g T 6. lfn ihydraulic (elevator, a motor, a

' pressure tank, :means for supplying operatl'ng flltld'iiO the motor from saldftankgiamusn -=1on1ng reservoir comprlsrng'ra'iir and water chambers,ra piston in Said resenvoirsubijected to the pressure-iin thealrichamben'means for maintaining a pressure in the. :air sohamber ltan'k, andwan operative eonnectionbetiween said chambers and the 'motor, gsnbstantia l-ly ;asidescri bed. f

7 In a hydraulic elevator, a motor, a pressure tank, means for Supplying operating fluid to the motor from said tank, a cushioning reservoir having an operative connection with the motor and an operative connection with said pressure tank, substantially as described.

8. In a hydraulic elevator, a pressure tank having air and water therein, a motor, means for supplying the motor with operating fluid from the tank, a control valve for said supply, a cushioning reservoir, a piston valve for said reservoir, an operative connection between said control valve and said reservoir for subjecting one end of thepiston valve directly to the action of the operating fluid, and a second connection between the reservoir and the upper end of the pressure tank for subjecting the other end of the piston valve directly to the action of the air pressure in the tank, substantially as described.

vtive connection between said reservoir and said motor, and a connection between said reservoir above said piston and the pressure tank for subjecting the piston to the pressure in said tank, substantially as described.

In testimony whereof I have hereunto set my hand.

JOSEPH P. OSCHGER. 

